First go to your Laptop Support Download page and download and install their AMD Driver. They are customized to be 100% compatible with your laptop.
Second if your Laptop has an AMD APU, you must download the APU AMD Driver and not the HD85xxM series driver. The AMD APU driver will install both the APU's integrated Graphics and your HD 85xxM GPU graphics driver.
But if your laptop has an Intel APU then your just need to download the AMD Graphics driver for the HD 85xxM GPU Card plus your Intel Graphics and CHIPSET must be the latest Intel Driver versions installed for the AMD driver to work.
You can run GPU-Z (free program) to see the exact GPU card you have installed. Then go here and download it: https://www.amd.com/en/support